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A penetrating breaker roll decurl unit is programmed to treat web curl automatically as the roll unwinds. In “Intelligent” mode, decurl movement is programmed from the start point to the end point. Rollstand's tension controller calculates the diameter of the roll. When a new roll is started, bi-directional breaker roll automatically reverts to the start position. A bar graph indicates decurler's position as a percent of penetration, allowing operators to follow “best practice” routines.